Grinding attachment for lathes.



D. V ANDEWATER.' GRIN'DlNG ATTACHMENT FOR LATHES.

1,148,729, matentem s, 1915.

7 zsuzns-susznm APPLICATION FILED FEB. 13. 1915.

WITNESSES: 24 IIVI/ENTOR Daniel Vndewater v v Y' "oNEn STATES PATENT uric DANIEL VANDEWATER, OF RIVER/TON, WASHINGTON.

GRINDING ATTACHMENT FOR LATHES.

Application filed February 13, 1915. Serial N 0. 7,950.

ments for lathes or other machines, and, more particularly, designed for grinding and polishing the inside surfaces of cylinder bores:

The object of the present invention is to provide simple, inexpensive and efficient grinding appliances which may bequickly applied to or detached from an ordinary machine lathe;

With these ends in view, the invention consists of a holder for the work secured to the lathe carriage, a tool carrier secured to the face-plate of the lathe and adjustable diametrically thereof and having a spindle, a sleeve having at one end the emery wheel or an equivalent, and means for rotating said member and the Wheel independently of the orbital. movement thereof which is afforded to the face-plate by the usual lathe I driving mechanism.

Fig. 2 is an end elevation of the grinding The invention further consists in the novel construction and adaptation of the various parts, as will be hereinafter described and claimed;

The invention is illustrated in the accompanying drawings, wherein Figurel is front elevation of a lathe with my improved grinding devices applied thereto.

devices proper attached to the face plateof the lathe and showing the rotary driving connections. Fig. 3 is a detail sectional view through 8.-3 of Fig. 1. Fig. 4 is a view partly in front elevation and partly in longitudinal section illustrating the mounting of the rotary sleeve on the spin dle. Fig.5 is a transverse sectional view through-the face-plate and the tool-carrying plate and showing themanner of adjustably securing the. latter to the face-plate.

Referring to the drawings, 6 represents the lathe-bed, 7 the head-stock, 8 the faceplate mounted upon an arbor 9 which is rotated by a suitable drivingmeans including a belt 10 passing about cone pulleys 11- and 12 of the lathe and a counter-shaft 13.

14 indicates the carriage movable longitudinally on the lathe-bed 7 through the power-driven Specification of Letters Patent.

Patented Aug. 3, 1915.

agency of feeding mechanismsuch as com- I monly employed.

In carrying out my invention, the Work 1V, representingthe cylinder of an automobile engine which is to be internally ground is secured in axia'l alinement with the so-called live-center of the lathe, as by bolts 15,to'the vertical member 15 of a holder whose horizontal member is secured to the carriage 14.

16 represents a disk flange of a' shank 1-7 which terminates in a tapering spindle 18.

Rotatable on said spindle and preferably journaled on bushings- 19 provided thereon is a sleeve 20 which is closed at its outer end and terminates in a screw-threaded stud 21. 22 represents a cup-shaped emery wheel which is secured axially upon'said stud. by means of a nut 23. The referred-to bushings-are desirably of brass and'the annular,

space between. the bushings may be filled With Babbitt or other suitable anti-friction metal to furnish a relatively large bearing surface to the sleeve.

Seated in a T-shaped groove 24 extending diametrically across the face-plate 8 are the heads of bolts 25 which pass through holes 26 provided in the shank-flange 16. These bolts also extend through eyes provided in extend through apertures provided in posts 28. The posts 28 are formed with screwthreaded portions 28 fitted in holes provided in the face-plate and are rigidly secured to the latter by nuts 29.

The bolts 25 and 27 are each screw-threaded to respectively receive nuts 25 and 2-7 The shank -17, together ,With the spindle 18 which is integral therewith, is adjustends of adjustment bolts 27 which, in turn, I

able radially of the face-plate by regulating I the nuts 27 and, when thus adjusted to provide the requisite eccentricity of the spindle with respect to the axis of the faceplate,the nuts 25 'are screwed hard against the adjustment. bolts to rigidly retain the flange in juxtaposition with the face-plate.

30 represents a finger-piece secured to the shank 17 by bolts 31.and has an inwardly directed end 30 whichengages in a circumferential groove 20 provided in the sleeve. This finger serves to prevent any axial movements of the sleeve with respect to the spindle; but to take up the wear in the sleeves tapering, journal, the finger is made adjustable by the provision of a longitudi' nal slot 30 to accommodate the bolts 29.

Formed or provided on the sleeve 20 is a pulley element 20 ,for a belt 32 which receives its motion from'a driving pulley 32 on a second counter-shaft 13 having a rela tively high speed.

In view of the eccentricity of the axis of pulley 20 the same must be rotated while revolving about the axis of the face-plate. Accordingly, I provide compensating means for obviating the belt-slack due to such orbital travel.- Such means comprise a guidepulley 33, and a tightener 34: which is supported, as shown in 'Fig. 2, by vibratory arms 35 and yieldingly held against the belt by a helical spring 36 or equivalent devices. In' grinding the interior of a cylinder, it is advantageous to remove the material which is ground from the same, for which purpose I employ a power driven suction fan,

indicated by 37, which is connected with one 'of the cylinders port openings by pipe-38.

The operation of the invention is as follows: The cylinder or-work W .which is to have its bore ground, is secured to the holder 15 so as to have the axis 'of the cylinder in alinement with the axis of the faceplate 8. The posts 28 are secured to the face-plate by means of the nuts 29., The

-flange 16 is then secured to the faceplate with the radius of the grinding wheel 22,

,willlequal. the radius of the cylinder-bore when ground. Being thus regulated, the nuts 25 and 27 are screwed tight down to. securely hold the flange to the face-plate. The belts 10 and 32 are then rendered operative to rotate the face-plate and sleeve 20. The work is thereupon broughtforward with-the carriage so as to be subject to the grinding wheel 22, and is 'in like 7 manner progressively fed until the grinding cut is completed. VVhat I claim, is-' 1 1. The combination with a face-plate and means for rotatingiit,of a spindle, means provided on an end of the spindle whereby the same may-be rigidly secured to said face-plate for supporting the spindle from I such end only and in eccentric position with,

respect to the face plate, a sleeve rotatablymounted on said spindle, a grinding wheel secured to said sleeve, and .poWer-driven means for rotating the sleeve and-the grind 'ing-wheel during theorbital travel of the same about the axis ofsaid face-plate.

' February,

.2. The combination with avface-plate and,

means for. rotating it, of a spindle having .a' flange at one end,'means for adjustably moving the spindle with respect tothe axis of said face-plate, means extending through said flange and the face-plate for rigidly securing said spindle in such adjusted posi- .tions, a grinding Wheel carried by said spindle, and means to rotate the grinding wheel during its revoluble'travel about the axis of the face-plate,

3. A cylinder-grinding attachment for lathes, which consists of a tapering spindle provided with a flange, means for adjustably securing said flange to the face-plate of a lathe, a sleeve mounted to rotate upon said spindle, a pulley formed upon said sleeve, a grinding wheel secured'to the outer end of said sleeve, and a power-driven belt engaging said pulley to effect the rotation of said grinding wheel.

.4. A cylinder-grinding apparatus, comprising, in combination, a lathe, a countershaft, operative connection between said counter-shaft and said lathe, a face-plate for the lathe, a spindle adjustably secured to said face-plate, a sleeve mounted to rotate .upon said spindle, a grinding wheel secured upon the outer end of said sleeve, a beltpulley'formed upon said sleeve, a belt-pulley upon said counter-shaft, a belt operatively connecting said belt-pulleys, a tightener-Wheelior said belt, and means for holding a cylinder in axial ali-nementwith that of the face-plate.

5. 1n a cylinder-grinding appai'atus, in combination, a. lathe, a face-plate therefor,

a counter-shaft, operative, connection be- ,tween said counter-shaft and said face plate, a carriage for the lathe, a spindle adjustably secured to said face-plate, a sleeve mounted to rotate upon said spindle, a grinding wheel secured to the outer end of said sleeve, a belt-pulley formed uponsaid sleeve, a belt-pulley upon said counter.-

shaft, a belt operatively connecting said belt-pulleys, a tightener for said belt,"a

work-holder, means for securing said Work holder upon said carriage, means for secure ing a cylinder'to saidwoik-holder, means for progresslvely moving said carriage and work-holder toward said spindle, and a suction fan-adapted to withdraw theparticles produced by the grinding'wheel;

Signed at Seattle, 1915. v

DANIELI vAuDEwATER. Witnesses: I, I

, PIERRE BARNEs, l E. W.D1m1zr." I ll WVash, this 2nd dayof grinding ahead of said 

